[accessibility] hide inaccessible backlogs view

init.rb

@@ -110,5 +110,6 @@ Redmine::Plugin.register :backlogs do
        {:controller => :rb_master_backlogs, :action => :show},
        :caption => :project_module_backlogs,
        :after => :new_issue,
-       :param => :project_id
+       :param => :project_id,
+       :if => lambda { User.current.respond_to?("impaired?") and !User.current.impaired? }
 end